06/15/2026
Every business that accepts credit cards pays interchange fees, but most people have no idea what interchange actually is.
What's interesting is that interchange isn't really a processor fee. It's primarily money that flows to the cardholder's bank and helps fund things like fraud protection, credit risk, and rewards programs.
It also creates some interesting economic incentives. The premium travel card that earns free flights and airport lounge access often costs a merchant significantly more to accept than a basic debit card, even if the purchase amount is exactly the same.
I spent some time digging into the mechanics and economics behind interchange fees. It's one of those things that quietly influences how banks compete, how rewards programs are funded, and what businesses ultimately pay to accept cards.
Worth understanding if you're involved in payments, fintech, or run a business that accepts credit cards.
When a customer taps, inserts, or enters a credit card online, the transaction appears almost instantaneous. A receipt is generated, funds begin moving, and the sale is complete. Behind that simple experience, however, exists one of the most sophisticated financial systems ever built. Every card pay...